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122 lines
3.3 KiB
122 lines
3.3 KiB
package dao
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import (
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"errors"
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"time"
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"github.com/Masterminds/semver/v3"
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"github.com/rocboss/paopao-ce/internal/conf"
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"github.com/rocboss/paopao-ce/internal/core"
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"github.com/rocboss/paopao-ce/internal/model"
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"github.com/sirupsen/logrus"
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)
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var (
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errNotExist = errors.New("index posts cache not exist")
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)
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func newSimpleCacheIndexServant(getIndexPosts indexPostsFunc) *simpleCacheIndexServant {
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s := conf.SimpleCacheIndexSetting
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cacheIndex := &simpleCacheIndexServant{
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getIndexPosts: getIndexPosts,
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maxIndexSize: s.MaxIndexSize,
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indexPosts: make([]*model.PostFormated, 0),
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checkTick: time.NewTicker(s.CheckTickDuration), // check whether need update index every 1 minute
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expireIndexTick: time.NewTicker(time.Second),
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}
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// force expire index every ExpireTickDuration second
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if s.ExpireTickDuration != 0 {
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cacheIndex.expireIndexTick.Reset(s.CheckTickDuration)
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} else {
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cacheIndex.expireIndexTick.Stop()
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}
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// indexActionCh capacity custom configure by conf.yaml need in [10, 10000]
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// or re-compile source to adjust min/max capacity
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capacity := s.ActionQPS
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if capacity < 10 {
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capacity = 10
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} else if capacity > 10000 {
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capacity = 10000
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}
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cacheIndex.indexActionCh = make(chan core.IndexActionT, capacity)
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// start index posts
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cacheIndex.atomicIndex.Store(cacheIndex.indexPosts)
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go cacheIndex.startIndexPosts()
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return cacheIndex
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}
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func (s *simpleCacheIndexServant) IndexPosts(_userId int64, offset int, limit int) ([]*model.PostFormated, error) {
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posts := s.atomicIndex.Load().([]*model.PostFormated)
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end := offset + limit
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size := len(posts)
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logrus.Debugf("get index posts from posts: %d offset:%d limit:%d start:%d, end:%d", size, offset, limit, offset, end)
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if size >= end {
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return posts[offset:end], nil
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}
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return nil, errNotExist
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}
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func (s *simpleCacheIndexServant) SendAction(act core.IndexActionT) {
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select {
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case s.indexActionCh <- act:
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logrus.Debugf("send indexAction by chan: %s", act)
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default:
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go func(ch chan<- core.IndexActionT, act core.IndexActionT) {
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logrus.Debugf("send indexAction by goroutine: %s", act)
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ch <- act
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}(s.indexActionCh, act)
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}
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}
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func (s *simpleCacheIndexServant) startIndexPosts() {
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var err error
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for {
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select {
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case <-s.checkTick.C:
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if len(s.indexPosts) == 0 {
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logrus.Debugf("index posts by checkTick")
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if s.indexPosts, err = s.getIndexPosts(0, 0, s.maxIndexSize); err == nil {
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s.atomicIndex.Store(s.indexPosts)
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} else {
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logrus.Errorf("get index posts err: %v", err)
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}
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}
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case <-s.expireIndexTick.C:
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logrus.Debugf("expire index posts by expireIndexTick")
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if len(s.indexPosts) != 0 {
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s.indexPosts = nil
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s.atomicIndex.Store(s.indexPosts)
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}
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case action := <-s.indexActionCh:
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switch action {
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// TODO: 这里列出来是因为后续可能会精细化处理每种情况
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case core.IdxActCreatePost,
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core.IdxActUpdatePost,
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core.IdxActDeletePost,
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core.IdxActStickPost,
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core.IdxActVisiblePost:
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// prevent many update post in least time
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if len(s.indexPosts) != 0 {
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logrus.Debugf("remove index posts by action %s", action)
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s.indexPosts = nil
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s.atomicIndex.Store(s.indexPosts)
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}
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default:
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// nop
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}
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}
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}
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}
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func (s *simpleCacheIndexServant) Name() string {
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return "SimpleCacheIndex"
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}
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func (s *simpleCacheIndexServant) Version() *semver.Version {
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return semver.MustParse("v0.1.0")
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}
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